Conditionals (zero,1st,2nd,3rd,mixed) / If clauses

Zero Conditional

Introduction

The zero conditional is a structure used for talking about general truths — things which always happen under certain conditions. These include scientific facts and general truths

Examples:

If it rains, the grass gets wet. This is basically always true — the rain makes the grass wet.

If you cross an international date line, the time changes. This always happens — every time you cross a date line.

Wood doesn't burn if there is no air. This is a scientific fact — wood needs air in order to burn. No air = no fire.

*If the "if" clause is first, use a comma. If the "if" clause is second, do not use a comma.

Practice Sites: 1; 2 ;3

First Conditional Form

Practice: 1; 2 ; 3 ;

Second Conditional

The second conditional talks about unreal situations.

http://www.youtube.com/results?search_query=second+conditional

Practice: 1; 2; 3; 4;